Hello everybody.

While browsing some other guitar-sites, I've noticed that people keep mentioning practice sessions, but they never really say anything about what's in them. So I ask you folks here, hoping that someone can clarify it a bit. What's in a practice session? Most of the time, I just play the progressions in the lessons I'm at or practice songs, but there must be some better way to use practice-time efficiently. What is the ideal composition for a practice session? I can imagine that Improvisation and practicing techniques is a big part of it, or is that wrong?